Reigniting liquid-fuel burner



J n- 1945. A. J. TURPIN 2,368,179

REIGNITING LIQUID FUEL BURNER Filed Dec. 17, 1943 INVENTOR ALEXA N051? d 7URP/N ATTORNEY Patented Jan. 30, 1945 REIGNITING LIQUID-FUEL BURNER Alexander J. Turpin, Stewart Manor, N. Y., assignor to Hauck Manufacturing Company, Brooklyn, N. Y., a corporation of New York Application December 17, 1943, Serial No. 514,644

7 Claims.

The invention relates to liquid fuel burners designed more especially for use with so-called "flame cultivators in which, generally, a plurality of burners are carried by a movable vehicle and streams of hot products of combustion are directed simultaneously from the respective bumers toward weeds growing among a crop, as the vehicle passes through it, to eifect a selective destruction of the said weeds. Such apparatus is especially suitable for use in connection with the growing of sugar cane, cotton, soy beans, corn, etc. In this multiple arrangement of burners .in groups of two or more burners to a vehicle, it

is apparent that if one burner should-become extinguished, it would not be feasible in passing through the crop to interrupt the operation of all of the remaining burners, and also to stop the motion of the vehicle, to relight the particular extinguished burner, as the streams of hot gaseous medium from the remaining ones would in the meantime burn or severely injure the adjacent crop. So long as this vehicle is in motion, the hot gases from the burners are applied only momentarily tothe weeds and. do not affect to any appreciable degree the crop, due to the high position of the foliage of the crop and to the more or less rapid transit through said crop of the vehicle carrying the battery of burners.

It is an object of the present invention to pro-.

vide a burner for use with flame cultivators which, in the event of the flame of one or more burners becoming extinguished, renders it unnecessary to stop the vehicle in order to effect reignition of the particular burner. Only a momentary interruption of the same will therefore occur, which might result merely in a short stretch of weeds not being entirely destroyed, all of the remaining burners, however, continuing their activity in this respect.

A further object of the invention is to provide a novel construction of burner in which reignition will be rapidly effected .and the burner is so constructed that the means for eifecting the reignition will not to any objectionable degree impair the effectiveness of the normally discharged I stream of products of combustion Another object of the invention is to provide a'burner of this type which will not, due to the reignition provision, become overheated and have its life thereby shortened.

Still another object of the invention is to provide within the burner itself all of the thermal elements necessary to effect reignition of said burner.

In carrying out the invention, the burner is stream of air under preferably in the form of a casing contracted. toward its discharge end .and having attached to its opposite or inlet end means for introducing into the casing a liquid fuel, together with a pressure for atomizing the liquid fuel. A suitable nozzle or atomizing element is mounted in the inlet end of the casing with associated fuel and air supply means, and is arranged to communicate therewith and to discharge into an inspirator throat member or chamber extending axially inwardly into the easing from its inlet end. The atomizer nozzle is preferably mounted eccentrically withrespect to the throatmember, though coaxially with an outlet opening or throat therein. so that a stream of atomized fuel passing into the burner casing will be directed slightly eccentrically with respect to its longitudinal axis. Suitable air admission serves also to intercept a; small portion of the outwardly directed stream :of products'of combustion at the periphery of the stream and to turn it backwardly and over a thin, inwardly directed projectionor palate extending from the middle of the dam and supported only thereby. This palate provides an ignition point for vapors generated in any pool of fuel held in the immediate region of said-dam below the palate, being at substantially the hottest point due to the passage of the bac'kwardly diverted products of combustion thereover and over the dam of which it is an integral par The nature of the invention, however, will best be understood when described in connection with the accompanying drawing, in which:

Fig. 1 is a longitudinal section through the novel reignition burner, the same being shown located substantially in the position in which it is to be used in cultivating a crop.

Fig. 2 is a transverse section taken on the line 2-2, Fig. 1 of the drawing; and Fig. 3 isa similar view taken on the line 3-3, Fig. 1 of the drawing.

Referring to the drawing, l0 designates a casing or burner body which contracts toward the -under suitable pressure,

note of combustion are discharged by the burner in its operation. The opposite end of the burnor is provided with an inlet opening I! coaxial with the opening or outlet l I. Opening I2 is designed to receive an elbow member l3, which may be flxed therein by means of the set screw I4 and is designed to retain a nozzle element for atomizing fuel into the burner body. This is effected preferably through an intermediate inspirator throat member or secondary casing l5 coaxial with casing ill. A discharge opening [8 in this secondary casing, however, is displaced radially with respect to the longitudinal axis of the casing In for the purpose hereinafter set forth, but is coaxial with the discharge opening or orifice ll of the nozzle element.

This nozzle element comprises an inlet port H for gaseous atomizing medium such as air said port being coaxial with the orifice i1 and it communicates with a supply pipe IQ for the gaseous medium, saidpipe being threaded into the outer end of the elbow member i3. Liquid fuel such as a suitable oil is supplied through a pipe 20 mounted coaxially within the pipe i9 and threaded at its inner end into the said elbow member to communicate with a ort 21 therein, which in turn is in communication with a circumferential port 22 about the atomizing element. From this latter port, a radial port 23 communicates with the discharge orifice H.

The pipes i9 and 20 for supplying respectively gaseous medium and liquid fuel serve also as a convenient supporting means for the burner and at their outer ends are rovided with respective fittings 25 and 26 including respective shut-off and control valves 21 and 28 for the fluids flowing therethrough.

Both the casings l and P are provided with peripheral openings for admission of air into their respective interiors, a series of circumferentially disposed openings 30 being providedin the casing i0 and a similar series of openings 3| in the casing 15. In addition, there is provided at the bottom of casing i5 substantially at its far end an additional opening 32 for immediate discharge from the casing I5 of any liquid fuel which might be deposited therein from the atomizing nozzle element, particularly when the flame of the burner becomes extinguished and the supply of atomizing medium is interrupted.

In accordance with the invention, provision is made to pocket and accumulate such fuel then at the bottom of the casing l0 near its outlet end. This is accomplished by extending transversely across the bottom of said casing III a partition 35 extending upwardly a slight distance above the bottom and with which it has an arcuate connection, said partition being preferably directed inwardly into the casing. The top of the partition extends sufficiently into the casing to intercept a small portion of the stream of products of combustion, discharged by the nozzle element and passing through the outlet opening IE, to cause said intercepted portion to be rolled backwardly along the bottom toward the secondary casin 15, as indicated by the arrows.

In addition, the partition 35 is provided with an integral fin 36 directed inwardly from said partition substantially at the middle of the same, said fin being of reduced width at the bottom where it joins the bottom of the casing H! in order to concentrate the mass at the uppermost portion where contact is had with the intercepted streams of gaseous medium and to reduce as 'fiame becoming much as possible on the fin the cooling effect of the casing wall. The purpose of this arrangement is to provide an extremely hot or ignition point for reignition of the burner in the event of its extinguished. When this occurs,

- liquid fuel may be accumulated upon reducing the pressure of the gaseous medium through manipulation of the corresponding valve 21. The damming of the flow of fuel by the partition causes a sufficient volume thereof to be pocketed at the base of said partition which will vaporize as a result of the contact with the portions of the casing bottom heated by the diverted heated products of combustion. When this vapor contacts the still-higher heated top of the fin 38, it will become ignited and the burner be restored to operation. The valve 21 may then be readjusted to secure the proper desired combustion.

I claim:

1. A burner for liquid fuel, ing having a discharge opening at one end for products of combustion and an inlet opening at the opposite end, and provided with peripheral openings to the atmosphere, means located at the inlet opening to discharge into the casing a stream of atomized fuel, and a transverse dam for liquid fuel extending upwardly from the bottom of the casing near its outlet end and terminating in an edge across the bottom adapted to intercept a portion of the discharged products of combustion, and said dam having a fin supported respectively with the by and extending rearwardly therefrom and up;

wardly substantially to the top thereof.

2. A burner for liquid fuel, comprising a casing having a discharge opening at one end for prodnets of combustion and an inlet opening at the opposite end, and provided with peripheral openings to the atmosphere, an elbow member fitting said inlet opening having a liquid fuel port and a port for a gaseous atomizing medium, said member constituting a nozzle for atomizing the fuel, supply pipes carried by the elbow communicating said fuel port and the said gaseous-atomizing-medium ort, control valves in the respective pipes, and a transverse dam for liquid fuel extending upwardly from the bottom of the casing. near its outlet end and terminating in an edge across the bottom adapted to intercept a portion of the discharged products of combustion, and said dam having a fin supported by and extending rearwardly therefrom and upwardly substantially to the top thereof.

3. The burner of claim 1, wherein the dam has a rearward arcuate connection with said bottom of the casing.

4. The burner of claim 1, wherein the fin is located substantially midway of the dam.

5. The burner of claim 2, wherein a secondary and inspirator casing extends inwardly from the inlet of said casing and is in communication with the ports of the elbow member and through peripieral openings with the interior of the burner casing, said secondary casing having an outlet opening or throat coaxial with the atomizer nozzle, the longitudinal axis of said secondary casing outlet opening being radially displaced with respect to the discharge axis of the casing outlet in a direction away from the partition.

6. The burner'of claim 1, wherein the dam is inclined toward the rear of the casing.

7. The burner of claim 1, wherein the fin is of reduced width at the bottom where it joins the bottom of the casing.

ALEXANDER J. TURPIN.

comprising a cas- 

